Oops, it doesn't look like 'shit posting day' is a national day..

Other days

boba

Boba Day
ruby

Ruby Day
ormille

Ormille Day
self care

Self Care Day
eat what you want

Eat What You Want Day
one

One Day
pumpkin

Pumpkin Day
singles

Singles Day
stress awareness

Stress Awareness Day
aloxolt

Aloxolt Day